LCL型逆变器的电容电压反馈谐振抑制方法  

Capacitor V oltage Feedback Resonance Suppression Method for LCL-type Inverter

作　　者：杨子江 杜贵平[1] YANG Zi-jiang;DU Gui-ping(South China University of Technology,Guangzhou 510641,China)

机构地区：[1]华南理工大学,电力学院,广东广州510641

出　　处：《电力电子技术》2024年第8期5-7,44,共4页Power Electronics

基　　金：广东省自然科学基金(2022A1515240036);广州市重点研发计划(202206010175)。

摘　　要：LCL型并网逆变器被广泛应用于光伏、风力等分布式发电系统。由于LCL型滤波器的频率特性曲线在固有谐振频率处存在谐振尖峰,会导致系统失稳。基于电容电压反馈的有源阻尼方法,反馈量为微分环节,物理上不能完全实现,对于谐振抑制有着不利的影响。为此构造了一个比例-惯性环节作为反馈量,并利用奈奎斯特稳定判据研究了系统稳定的参数取值范围。该方法能够直接控制并网侧电流,抑制谐振尖峰。通过仿真和实验验证了该方法的有效性。The LCL-type grid-connected inverter has extensive application in photovoltaic,wind and other distributed power generation systems.Due to the resonance peak at the natural resonance frequency in the frequency characteris-tic curve of the LCL-type filter,system instability may occur.The active damping method based on capacitor voltage feedback employs a differential link as the feedback quantity,which can not be physically realized entirely and has adverse effects on resonance suppression.To address this issue,a feedback quantity in the form of a proportional-iner-tia link is utilized,and the range of the system stability parameter is analyzed through application of the Nyquist sta-bility criterion.This approach enables direct control of current on the grid-connected side while effectively suppressing resonance peaks.The effectiveness of the method is verified through simulation and experiments.

关 键 词：逆变器 谐振抑制 电容电压反馈 

分 类 号：TM464[电气工程—电器]